In B-52G&H models, the procedure for upward-ejecting seats was to insert the pins and lower the armrests (they were pivoted at the back), which additionally disabled the firing mechanism and made it easier to get in and out. The RN and NAV had downward seats and some kind of pull handle between their legs: no idea how that worked. The NAVs never had time to take a leak, anyway.
Only the seat being left would be safed.
IIRC, when not in use, the seat pins were stored in cloth pouches on the side of the seat across the aisle.
Earlier models had different seats and I don't remember them well enough to comment,